Good computer strategy/RPG games

Do you know any really complex, innovative and playable computer strategy/RPG games worth playing? When I was a bit younger I used to play quite a lot and I think I've played every major title there is, from Civilization through Heroes of M&M to Planescape:Torment. Now most games seem to be boring (I got older :) ), they hardly ever introduce any genuinely new elements into gameplay, and that's especially true about mass-market games, so I'm looking for some less known titles. As for RPG I tried roguelike stuff like ADOM, but that's just hack'n'slash, and I tried Stars!, but I felt there's more bureaucracy there than real gaming. I'd like to find something really complex and difficult, but Google/Wikipedia bring nothing of that kind. Any suggestions?

The games by Battlefront, Combat Mission, Beyond Overlord, for one, are excellent games with a unique game engine. They are very accurate as far as weapons capabilities go. This is not fantasy, this is WWII. You plot your moves on a 3d battlefield, after each player has plotted, the computer plays a 1 minute movie of the combined moves. You have control of individual tanks and infantry squads, so it is a tactical level rather then strategic.